JP2014202120A - Exhaust system structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust system structure capable of preventing deterioration of the appearance of a tail pipe which is caused by rust occurring due to condensed water in an exhaust gas as well as deterioration of the appearance of a rear end surface of a muffler.SOLUTION: An exhaust system structure comprises: a muffler 2; a tail tube 1b which is attached to a rear end part of the muffler 2 and protrudes to the vehicle rear side; and a resin cover 3 which covers the rear end part of the muffler 2 and an area ranging from the rear end part to a rear end part of the tail tube 1b.

Description

  The present invention relates to a muffler used in an exhaust system of an automobile or the like and an exhaust system structure having a tail tube connected to the muffler.

As a conventional exhaust system structure, the one described in Patent Document 1 is known.
This conventional exhaust system structure improves the appearance by covering the rear end surface of the muffler with a cover cap formed of metal or synthetic resin, and the tail pipe protruding from the rear end surface of the muffler penetrates the cover cap and It extends to the end.

Japanese Utility Model Publication No.59-177719

However, the conventional exhaust system structure has the following problems.
In other words, the rear end surface of the muffler is covered with a cover cap to improve the appearance, but the tail pipe that protrudes from the rear end surface of the muffler to the rear side of the vehicle must be made of metal for the reasons of heat resistance. The condensate of the water travels through the tailpipe and rusts the surface.
In this case, even if the rear end portion of the muffler is covered with much effort, the rust of the tail pipe protruding rearward from the tail pipe can be seen from the outside of the vehicle, and the appearance is deteriorated.
In particular, condensate leaks from the rear end of the tail tube and rusts easily, and this is a problem because it is easily visible from the outside of the automobile.

  The present invention has been made paying attention to the above problems, and its object is to prevent not only the rear end face of the muffler but also the deterioration of the appearance due to the rust of the tail pipe due to the condensed water in the exhaust gas. An object of the present invention is to provide an exhaust system structure that can be used.

For this purpose, the exhaust system structure according to the invention is
Muffler,
A tail tube attached to the rear end of the muffler and projecting toward the rear of the vehicle;
A resin cover that covers the rear end of the muffler and from the rear end to the rear end of the tail tube;
It is provided with.

Also preferably, the exhaust system structure according to the present invention comprises:
Cut out the lower end of the middle part of the tail pipe, raised the raised part toward the inside of the tail pipe, and formed an opening by the notch in front of this raised part,
It is characterized by that.

  In the exhaust system structure of the present invention, since the rear end of the muffler and the tail tube are covered with a resin cover, it is difficult to see rust from the outside of the vehicle even if they rust, improving the appearance. be able to.

  In addition, the lower part of the tail pipe is cut out, and a cut-and-raised part and an opening in front of this are provided, so that condensed water due to moisture in the exhaust gas passing through the tail pipe flows further backward in the cut-and-raised part. As a result, it is possible to prevent the rear end portion of the tail pipe visible from the outside of the vehicle from being rusted.

It is the exhaust system structure which concerns on Example 1 of this invention, Comprising: It is the figure which showed the cover in cross section. It is the exhaust system structure which concerns on Example 2 of this invention, Comprising: It is the figure which showed the cover in cross section.

  Hereinafter, embodiments of the present invention will be described in detail based on examples shown in the drawings.

First, the overall configuration of the exhaust system structure of the first embodiment will be described.
The exhaust system structure of the first embodiment is a rear part of an exhaust system connected to an engine (not shown) of an automobile, and as shown in FIG. 1, an upstream exhaust pipe 1a and a muffler for reducing exhaust noise. 2, a tail pipe 1 b, and an integrated cover 3 made of resin.
The upstream exhaust pipe 1a, the muffler 2, and the tail pipe 1b are all made of metal.

The exhaust pipe 1a on the upstream side is disposed on the downstream side of the engine and a catalytic converter (not shown), is connected and fixed to the front end side portion of the muffler 2, and guides the exhaust gas discharged from the engine to the inside of the muffler 2.
The muffler 2 reduces the number of exhaust nozzles when the incoming exhaust gas passes through the inside, and has a known structure, and various types and structures can be adopted.
The tail pipe 1b is connected and fixed to the rear end portion of the muffler 2, and discharges exhaust gas discharged from the muffler 2 to the outside of the vehicle.

On the other hand, the resin-made integrated cover is made of heat-resistant resin, and the upstream flange portion 3a and the pipe portion 3b are integrally formed.
The flange portion 3a extends in the radial direction and covers the rear end portion of the muffler 2, and a portion extending forward from the outer peripheral portion toward the outer periphery of the rear end portion of the muffler 2 is formed by a plurality of screws 4. Fixed to the outer periphery of the rear end of the muffler 2. In this case, a gap is formed between the flange portion 3a and the rear end portion of the muffler 2 to suppress direct contact between them.

On the other hand, the pipe portion 3b is integrally formed with the flange portion 3a so as to be connected to a passage hole provided in the flange portion 3a. The pipe portion 3b has a smaller diameter than the flange portion 3a and has a cylindrical shape. The pipe portion 3b has an inner diameter slightly larger than the outer diameter of the tail pipe 1b and extends rearward along the tail pipe 1b. It is longer than the rear end of 1b so that the rear end of the tail pipe 1b is difficult to see from outside the vehicle.
On the inner peripheral surface of the pipe portion 3b, protrusions 3c extending toward the inner tail pipe 1b are provided at two locations in the longitudinal direction at three locations in the circumferential direction. A slight gap is provided between the inner end of the protrusion 3c and the outer peripheral surface of the tail pipe 1b so as to allow movement due to thermal expansion, manufacturing error, and vibration.

In the exhaust system structure configured as described above, the exhaust gas discharged from the engine is purified by a converter (not shown) in the exhaust gas and flows into the muffler 2 through the upstream pipe 1a.
In the muffler 2, exhaust noise of the exhaust gas is reduced, discharged to the tail pipe 1b, and discharged from the tail pipe 1b to the outside of the vehicle.

The muffler 2 and the tail pipe 1b cannot avoid the occurrence of rust due to rainwater or the like applied from the outside or the condensed water contained in the exhaust gas.
However, since the flange part 3a and the pipe part 3b of the resin cover 3 cover the rear end part of the muffler 2 and the tail pipe 1b, rust is hidden from the outside, and deterioration of appearance can be prevented. Become.
In addition, the rear end surface of the muffler 3 and the tail pipe 1b are also covered with the flange portion 3A of the resin cover 3 and the pipe portion 3b, so that it is possible to prevent the rainwater from being applied from the outside. It is possible to suppress the occurrence of rust caused by this.

  Next, another embodiment will be described. In the description of the other embodiments, the same components as those of the first embodiment are not shown, or the same reference numerals are given and the description thereof is omitted, and only the differences are described.

The exhaust system structure of the second embodiment of the present invention is the same structure as that of the first embodiment. In the tail pipe 1b, a part of the lower surface side is cut out and bent to the inner side of the tail pipe 1b so that the raised portion 1c is formed. It is formed. Of course, the cut-and-raised portion 1c is set to a size that blocks the exhaust passage of the tail pipe 1b and does not significantly suppress the emission of exhaust gas.
Further, the notch simultaneously forms a water draining opening 5 directed downward in the tail pipe 1b in front of the cut-and-raised portion 1c.
Other configurations are the same as those of the first embodiment.

The exhaust system structure of the second embodiment configured as described above can also obtain the same operations and effects as the first embodiment.
In addition, since the cut-and-raised part 1c and the opening 5 are provided in the tail pipe 1b, most of the condensed water in the exhaust gas is cut and raised as shown by the arrow W in the transfer chain line in FIG. The flow is prevented from flowing backward by the portion 1c, discharged from the front opening 5 to the outside of the tail pipe 1b, and discharged to the outside of the vehicle through the pipe portion 3b of the cover 3.
Therefore, it is possible to prevent the condensed water from flowing to the rear end portion of the tail pipe 1b as it is and the first rear end portion of the tail pipe 1b from being rusted.

  As described above, the present invention has been described based on the above-described embodiments. However, the present invention is not limited to the above-described embodiments, and even if there is a design change or the like without departing from the gist of the present invention, the present invention is included.

For example, the shape of the resin integrated cover 3 is not limited to that of the above embodiment.
In addition, the flange 3a of the cover 3 and the rear end of the muffler 2 are joined using the screws 5 in the first and second embodiments. However, other methods such as press fitting and engagement are possible. Good.
Further, the shape and position of the protrusion 3c of the cover 3 may be set as appropriate or may not be necessary.
Further, in the second embodiment, the condensed water discharged from the opening 5 of the water tail pipe 1b is externally applied to the lower surface of the pipe portion 3a of the cover 3 at any position from just below the opening 5 of the tail pipe 1b to the rear thereof. You may make it provide the opening extended to.

1a Upstream exhaust pipe
1b Tail pipe
1c Cut and raised part
2 Muffler
3 Cover
3a Flange
3b Pipe section
3c Projection
4 screw
5 opening

Claims (2)

Muffler,
A tail tube attached to the rear end of the muffler and projecting toward the rear of the vehicle;
A resin cover that covers the rear end of the muffler and the rear end of the muffler to the rear end of the tail tube;
An exhaust system structure characterized by comprising: The exhaust system structure according to claim 1,
Cut off the lower end of the middle part of the tail pipe, raised the raised part toward the inside of the tail pipe, and formed an opening by the notch in front of the raised part,
An exhaust system structure characterized by that.

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